Toothbrush



NOV. 18, 1941. L, KARSHMER 2,263,360

.TOOTHBRUSH Filed July 11, 1939 Invntor Lows I. KARsHmeR Patented Nov.18, 1941 UNETED STATES PATENT OFFICE TOOTHBRUSH Louis P. Karshmer, NewBrunswick, N. J.

Application July 11, 1939, Serial No. 283,908

1 Claim.

This invention relates to a tooth brush, the general object of theinvention being to provide a brush having a substantially V-shaped headwith bristles therein so constructed and arranged that two surfaces ofthe teeth can be cleaned simultaneously and in the most efficientmanner.

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts to behereinafter fully described, illustrated in the accompanying drawing andspecifically pointed out in the appended claim.

In describing the invention in detail, reference will be had to theaccompanying drawing wherein like characters denote like orcorresponding parts throughout the several views, and in which:

Figure 1 is a side view of the improved brush.

Figure 2| is a top plan view thereof.

Figure 3 is a front end view thereof. I

Figure 4 is a section on the line 4-4 of Figure 3.

Figure 5 is a bottom plan View of the head.

In these views the numeral I indicates the head of the brush which is ofsubstantially V-shape in end view or cross sectional view and thenumeral 2 indicates the shank which extends at an angle from the headand the numeral 3 indicates the handle connected with the shank andextending in the same direction as the shank, said handle beingpreferably of flat construction as shown more particularly in Figure 2and having a hole 4 in its free end which enables the brush to be hungup.

The bristles 5 project from the inner faces of the two limbs of the headand may be arranged in two or three rows, the drawing showing two rows.I prefer to make the inner bristles shorter than the outer ones and tohave them extend from the limb of the head at substantially right anglesand to have the outer rows extend from the limbs at approximately thirtydegrees to fifty-five degrees. Also I prefer to have the two limbs ofthe head arranged at approximately ninety degrees to one hundred twentydegrees angle to each other and the shank and the handle extend from thehead at approximately a thirty degrees angle.

This brush by its shape and structure and the proper position of thebristles to the gingivo dental junction makes it possible:

1st. Cleaning two surfaces simultaneously- (a) Bucco occlusal inposterior teeth. (b) Labio incisal in anterior teeth.

2nd. The bristles being set at the exact angle desired automaticallyplaces them correctly at gingivo dental junction.

3rd. The two sides of the brush, by virtue of their placement cleanssimultaneously either the occlusal-lingual or occlusal-buccal sides inposterior teeth and incisal-lingual or incisal labial in anterior teeth.

4th. When properly held, the side of the brush, horizontal to theocclusal or incisal surface prevents the brush from either slipping upor down from its original placement, thereby making abrasion of the gumsimpossible.

5th. The outer bristles being at an angle of 30 to 45 degrees to thesides of the brush, stimulates circulation in the free margin of thegums and enter the interproximal spaces, thereby expelling food debriswhich may be present.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changes may be made in the construction andin the combination and arrangement of the several parts provided thatsuch changes fall within the scope of the appended claim.

Having described the invention what is claimed as new is:

A tooth brush of the class described comprising a handle part and a headpart, said head part being of substantially V-shape in cross section,with one limb of the V-shaped head part extending approximately at rightangles to the other limb, and rows of bristles extending from the innerfaces of the limbs of said V-shaped head part, the bristles on each limbbeing arranged in two rows parallel to the line of intersection of saidtwo faces, the bristles of the inner row extending at approximatelyright angles from the limb and the bristles of the outer row extendingat approximately thirty degrees from the limb and toward the apex of theV-shaped head part, whereby when the bristles on one of the limbs engagethe occlusal surfaces, the bristles on the other limb extend upwardlytoward the crown of the teeth and engage the buccal surfaces of theteeth.

LOUIS P. KARSHMER.

